Then problem #2 with the display (mostly) is latency. Those CRTs were fast. Even 50ms of rendering latency is noticeable on a some of the console games that require very-precise input timing.

You get emulation latency (this may avoid that by using ASICs, at least); input latency above what the original hardware had, if you're not using the real thing (bluetooth...); any picture-conversion latency (this might avoid that, but I wouldn't bet on it) to digitize the signal into HDMI if you're working with real hardware with analog outputs; TVs that struggle to get under 50ms of latency, especially without making the picture look a ton worse; and then shader-induced latency if you're trying to make it look semi-correct. Like, getting it down to where it doesn't feel wrong is tricky as hell.

I think I'll pass giving them a single cent.

The biggest concern I have is accuracy. SNK wouldn't be able to just start manufacturing their old chip designs from the 90s again because a lot of the chips in the Neo Geo from other companies are no longer made, such as the 68000, Z80, and YM2610. This means that they'd have to make a new SoC that incorporates the IP from those chips. At that point there's no real benefit to the ASIC over an FPGA. It means the system costs less to produce, but if they find any inaccuracies in their new SoC design they won't be able to release an update to fix them. I'm cautiously optimistic, but I'm not going to place a pre-order until they release more details about what exactly is going on under the hood.

If instead one want the real HW, a working MVS PCB can be found for less that €100. A JAMMA cabinet would be the perfect place to use it, but with a supergun a CRT TV can give the same results. Cheap superguns can be found or built for around €30, fancy models can cost between €200 to €300 tho.

The carts aren't cheap tho, specially if original. I've only a battered "Puzzle Bobble" cart, it's a really fun game in PvP, but probably not the more iconic NeoGeo title.